3 • Theory
DA50S/DA55S/DA70S/DA75S AddressRight™ Printers Service Manual
3-1
3.1 Changes
From Earlier
Models
The DA50S/DA55S (WS51/WS56) and DA70S/DA75S (WS71/WS76) series
of printers are based on the previous Pitney Bowes shuttle head printers
(W660/W680 and W707/W790). For those familiar with the older models, the
changes implemented include:
• Updated Main Board, LCD/Keyboard Board/Print Head Driver Board and
added Ethernet/USB Interface Board. Now 100% RoHS compliant.
• Removed large transformer and replaced with heavier duty power sup-
ply (allows a graceful shutdown of the printer to allow the print head to go
back to its maintenance station and the software to be saved)
• New DC motor and high-resolution encoder (replaces stepper motor) for
greater paper control and less RFI
• Elimination of plug-in memory card to store fonts (now stored on SDRAM)
• Elimination of Centronics (parallel) and serial connectors (replaced by USB
and Ethernet board/connectors)
• Improved paper sensor calibration now accessible via LCD menu
• Keyboard/LCD display changed on DA70S/DA75S to match the former
W660/W680 (now DA50S/DA55S) 6-button style
• Added new second belt pass with spring-loaded tensioner
• New options on the control panel menus for greater flexibility and control
• Introduction of a “soft control panel” (running under Windows on a sepa-
rate PC) which mimics the features of the printer’s control panel while
also adding more diagnostic and administrative features
• Standardize most screws to square-head
• Easier to disassemble:
DA50S/DA55S – mounting screws are accessible after removing covers,
top assembly can be removed from base, cables are routed along base
DA70S/DA75S
–
new access holes or areas on side, end, and bottom for
quicker access to inside of unit
• Support for 18 languages in the documentation, soft control panel, and
labelling
• New cover colors and styling
